package com.cxp.tour.common;


import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/**
 * 图片上传到本地
 */

@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${images.path}")
    private String basePath;

    /**
     * 文件上传
     * @param file
     * @return
     */
    @PostMapping("/upload")
    public CommonDto<String> upload(MultipartFile file){

        //原始文件名
        String originalFilename = file.getOriginalFilename();
        String suffix = originalFilename.substring(originalFilename.lastIndexOf("."));

        //使用UUID重新生成一个文件名，防止文件名重复造成文件覆盖
        String fileName = UUID.randomUUID().toString() + suffix;

        //创建一个目录
        File dir = new File(basePath);
        //判断当前目录是否存在
        if(!dir.exists()){
            //如果目录不存在就直接创建
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+fileName));
        }catch (IOException e){
            e.printStackTrace();
        }
        CommonDto<String> commonDto = new CommonDto<>();
        commonDto.setContent(fileName);
        return commonDto;
    }

    /**
     * 文件下载
     * @param name
     * @param response
     */
    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){

        try {
            //输入流，通过输入流读取文件内容
            FileInputStream fileInputStream = new FileInputStream(new File(basePath+name));
            //输出流，通过输出流将文件返回给浏览器，在浏览器中展示图片
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");

            int len = 0;
            byte[] bytes = new byte[1024];
            while ((len = fileInputStream.read(bytes)) != -1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            e.printStackTrace();
        }

    }
}

